You can get a lot of the Legendary Pokemon in Diamond and Pearl. Unfortunately the legendary trio of Articuno, Moltres, and Zapdos; Raikou, Entei, and Suicune, Mew, Mewtwo, Lugia, and Ho-Oh are missing. They can be traded from other games but are not in the original game.
On Diamond you can find Dialga and on Pearl, Palkia. But you can also find Heatran and Girantina. [Whatever.]
Hope this answerd your Q.
EDIT- You can find Mesprit, Uxie, and Alzef in wild encounters, and Cresselia in a wild encounter.
The Legendary Pokémon you can encounter in Pokémon Diamond Version include-
Event-only Pokémon:
The term legendary birds is often used for the legendary bird pokémon Articuno, Zapdos and Moltres. You can't catch these birds in Diamond, but you can trade or migrate them to your game. You can find them in FireRed/LeafGreen, Platinum, HeartGold/SoulSilver and X/Y.
Only if you have the legendary pokémon on your ruby,sapphire,emerald, firered or leafgreen. all legendary Pokemon from Articuno to Deoxys is migratable.
Yes, but you need to trade or hack.
you can get some....not all
you can't catch it because you already beaten the legendary
The diamond is a hold item that Dialga, the legendary Pokemon in Pokemon diamond, holds, making its moves stronger or do more damage.
Darkria
It is not possible to get a Lugia egg in Pokemon Diamond. It is generally impossible to get an egg of a Legendary Pokemon the only exceptions being Manaphy and Phione.
There's one legendary in Diamond which begins with the letter C. This is Cresselia, a psychic type. You will first encounter it at Fullmoon Island, then it will roam Sinnoh.
you have to take it from Pokemon fire red or leaf green...they are not actually in the storyline for Pokemon diamond and pearl
No, in Diamond and Pearl you can't catch the legendary birds.
you get ruby and beat the game with fillin the pokedex.then you put the legendary birds into the PC and migrate them to pearl or diamond. it is fairly easy.
the legendary Pokemon in diamond and pearl are dialga and palkia.
They do not. All the legendary birds are single form pokemon.
The legendary birds are: Articuno, Zapdos, and Moltres.
No, a Bidoof cannot evolve into any Legendary Pokémon in Diamond.
Heatran
a lot of legendary Pokemon
Dialga
you cant unfourtanately
arceus